block: submit_bh() inadvertently discards barrier flag on a sync write
authorJens Axboe <jens.axboe@oracle.com>
Fri, 22 Aug 2008 08:00:36 +0000 (10:00 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Wed, 27 Aug 2008 07:50:19 +0000 (09:50 +0200)
Reported by Milan Broz <mbroz@redhat.com>, commit 18ce3751 inadvertently
made submit_bh() discard the barrier bit for a WRITE_SYNC request. Fix
that up.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
fs/buffer.c

index 38653e36e2252189dfad1cbf8f31f5473d2ccb00..ac78d4c19b3b3b27e812f13c0bd7669e962cea04 100644 (file)
@@ -2926,14 +2926,17 @@ int submit_bh(int rw, struct buffer_head * bh)
        BUG_ON(!buffer_mapped(bh));
        BUG_ON(!bh->b_end_io);
 
-       if (buffer_ordered(bh) && (rw == WRITE))
-               rw = WRITE_BARRIER;
+       /*
+        * Mask in barrier bit for a write (could be either a WRITE or a
+        * WRITE_SYNC
+        */
+       if (buffer_ordered(bh) && (rw & WRITE))
+               rw |= WRITE_BARRIER;
 
        /*
-        * Only clear out a write error when rewriting, should this
-        * include WRITE_SYNC as well?
+        * Only clear out a write error when rewriting
         */
-       if (test_set_buffer_req(bh) && (rw == WRITE || rw == WRITE_BARRIER))
+       if (test_set_buffer_req(bh) && (rw & WRITE))
                clear_buffer_write_io_error(bh);
 
        /*